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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78d1f9826d746e937aca2d5ed81f0afd54da07765997a07293b03799d4a8a693' 
  AND token = 'EepfuMC3e9sZH393V2W95v86tEMYd8XO03jICvVuZE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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