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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8949711164f7d73f91a12365679a5e411c6a15a7254e24f5119a028d92518eff' 
  AND token = 'lBUQmcDKgHD7bb5Mir4qia5F7jvt1q+O7hc52XHNCPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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