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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98988c6887dc5aa8cd5724b3c6bffec6b7010bf53c33b8ae8ed72d5f37814a12' 
  AND token = 'q6zs4NWOPP7c0dT6G09Sp04jsfQ9ki754LqcO3Uo6jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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