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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a13390d5ee3f41c1e3a8b85b0cf29dfd83603d9f1df153f7a38d6570ba0b851f' 
  AND token = 'exaJ0Yemk45JBajrNtoQF/ZXT4/IIE/T5r6uREVqUC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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