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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a10fff6056ce1eb13b35572b68d6077c4cafdc709a9ee9350a0b8f5627e33079' 
  AND token = '8nHq5xRA0r0EMhIsG6+ApLDHbl4hNqXXKNEIOx1Cecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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