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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd89671fc0b665490351e97a86023011c72872c260e13d01f79087eeaeca048c6' 
  AND token = 'rrQUpmpsMxtQTGTfgF+kelil+F1XkOua25AqSiKfEHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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