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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d0c8c6939e3edd34dd9e8eddec767c2b239bd75d0e4eeba477cd80e580f1edd' 
  AND token = 'KBZBwoXXdSC0lp5ksRwO6cqp+KQJXY/H8Mn++Ny6ByE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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