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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f3c52c9d9ecef85912dfc966e527619c4d57a0c2472979eda666fe855fb31bff' 
  AND token = '5rhfeywqEOY2aoHmbCSkNAY/Znh8VVa2TDkhZ0NSebU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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