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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7c96e89e50dc1a09f2ffde09d3464308f0e3f26947348c7d1fd7941f29476fe2' 
  AND token = 'oPJVvr58jQi94Ck2o+TxfPk3TE/xrK0yTZh53e/XKWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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