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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b39ebeb654473fb70b5b83280f37cb954c720f8942dabbde30437513dbdf0f56' 
  AND token = 'X9+n0bncsoQtlDoBB9Rd5RqmAREG310L1doEcoyrCPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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