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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc7bbe254619b37f5f7c1be049bba247f9aa19e74a8a7f3c11f09db516c9be51' 
  AND token = 'MtkysgGRFOxInkopABJykV67d2W6aaoDxw/SaVWDWIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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