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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11613ef3b92fcfe716f6b1dc3c64533f749dc0890d6e4a06dc0daa33b0b10b21' 
  AND token = 'B1J9QMDAsRk6iY9CAi2Swv7q5D9GMi9Tj91B4XXbl/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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