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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '93df4cfcaa459f2f166acbf648097c4a1af0ade8faf247609d77a907b7e27ead' 
  AND token = 'Ldi9kTWNSg0ZcHB2eS9g443pf6tIBqkldg8WiwZJAjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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