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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1d98e047419015d651006527c32e580e381268387aed0fece9cb6c337fbc9616' 
  AND token = 'SKOIKZyrUqaV2rQPPNFbqmc/9CLyRYP9pseFIfKpWiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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