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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd997aa2854d05756b8cb3ac5c4b34a9d37e5932824e2442c9f9c286ff1300852' 
  AND token = 'RZaTSJCA+E35D6eAy8UDgYnffsN/WYH9x4VL1NuAiZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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