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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd44f8d8f6a7e0db2aacd27e20cb376c75179e4276514a80357c9012c9110ac44' 
  AND token = 'cB7RC2rOHHFgaU2vSEKLbhHSjCLa+hJT0WmrD7kbg+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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