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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13c85a2833cdf7b56895b924a411e65cade4dd1f71b0c04c1df462000b09b0bc' 
  AND token = 'V4GgyUEDs6UExtDJUl+pTnXjWA028rw+XF5+5c68WpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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