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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8522d3cefb0a62142c65cfae27a1f6930efbea97fe9dd2a58fa519a5f2d280c4' 
  AND token = 'TUwQnpsjbtH7OVXjypVw1FHkAcEQFwXzPl05ejlT79k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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