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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '472e5887cd8d961375a7b54b6641f78619a17e12d65bf4047f41dcf0b93a0bb6' 
  AND token = 'r61zLp+7gDFqbycb7IDfaiJgLB3OtUij/+ck9ID5e7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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