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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '032a103de2ba79140576cb2386659dd54ffdada35949a70ed08d030aebae42af' 
  AND token = 'HagNw8L0/Py/fDBInKNgLf3a3rbrZX1gwQYK9Pe2dUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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