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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '112ad640b7f42f154c7869a1263f31fcc8486413b793b04862ff752124598224' 
  AND token = '4Qd8ErgftW7N0DLA7x3qkc8oEkcXlkAwPCFhbq8OmWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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