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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '437a07655509d19e478a6bde9dfa9ac54667d893580e2bb61844595cf62c026a' 
  AND token = 'L3ZWwEgcdAP5IBwQR92RAlLdN9PQHyaA6FGrpplHb+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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