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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30f92168c1320d8919bbc14abc40605b6568a8d495c6ba02b65f0cf229d32d02' 
  AND token = 'pgUHDyC5EBafd+rjkmoeoiYfu9HQsHSIcS27X+HYrdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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