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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d018e5d2e7d23738a6a454bd75d39af7a9e37f83641aceec70d887ed497cdc7' 
  AND token = 'LHWM3Flig8RUomEEPbDAKHZDaJyJUuBcktjhP7Y0PME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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