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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3cc2bba91d596b9fb166d22a364c9ccf6e2f15223d9ded59968585c971139bab' 
  AND token = 'K/mNLg1zRstMlrRCrpvcHsrgNiq6+vmNGS5cFNHtz10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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