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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd3648d4f2030dbdb9820f8d1d46dc3301b300c4da7122bce052a37fca992ac70' 
  AND token = '/aYBXS646XkQbeMZcPObkEA9mPNfWGxLqGsltL5Ev0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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