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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea637c438c13e25f9644bcb01cfd17e01891c577130339d88b175b9fbff3aab8' 
  AND token = 'SPXNUkUYMzGs2TI1dHLURtHHOpV5K42vEbdX0820Mr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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