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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b0dbbb75d1f70c54314b63789f8a2925c3079ed6795255d9aed80104a24e247' 
  AND token = 'syn1xU8r8ewsk78wevuUcOVv8SvI/0N2aUGNdQ1J5j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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