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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f677b755c04d5b72554adedef891e3d6359fe83648b9c4a60fce0e47cad800b0' 
  AND token = 'o4/Xk+e7jdhWeWDm0ncXk9D/v0ecr/QYEDwhIMJ4q04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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