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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '391e7f90fa3174d6c087e10101fbc307c6bf66e47ca4d84e0d9476ffdf811d2e' 
  AND token = 'LQCsLeEBEyb3nz4k83fA/oY1IPAfxc1lNyDxwsLq3po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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