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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '918f362ef16144a12601153ba82821e5a6123e72ee9025f8365cc5bb2db5e4f3' 
  AND token = '1cVbFaJflgO5BbWbvN6Oc5yB5VfSjDnK4lMwDTiPE5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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