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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d2e35cfc18e428fd43cac4795dca9ed6b164dde60fc7d22f742313c4fd96b98' 
  AND token = 'ytel1p2b+6Mj0P6dFLI1QuADzrBy7uTWjsVlXS7WBCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}