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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '12d7fefb3967ff732a0a0e729c60d4385a4dff110c1ff8044f6f93e4fafae9f2' 
  AND token = 'wU8T0y6CUYaXAoeoGxom2cPHcln7BWTn1s4NCk61nt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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