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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1d1af0150f206467a564ed612b95fb836246ab03def300518b2e372988c2f79' 
  AND token = 'DwFTCnciZA1gVdjhd8OPcxrsU9LDrwLhkFVV8s0A1ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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