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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '482c1d7200adc8f72854a54da55cc5a7a27c9cadac9ded8227ec6f33e3dca7bc' 
  AND token = 'BUIVSQC2kbMzFYKPHsS/cYewPOD/LNtotpSChAyvxyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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