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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34eadb000c11d4f08c0e6f9f049d91a0a70e0ec911a90a0536ab8b9ff61e5fbd' 
  AND token = 'Wb8MPg6jYHi9PT9CQUwLASWLsTNtBcOUg1i2LRDYA/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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