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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3b899b4932eb6fb3255b6a7052a93ae19edb36dfa4059c9c78320e0ea28f8ee' 
  AND token = 'ck7/9Izp9JP+xDCR0sTwgIf2pwDwXX7fFFzQ68yCh0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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