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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d3d1ceb5641701c44bfa5875755af8215bbc22d922e3d85bbf121784cf92a3d' 
  AND token = '9K7F5ZZ7E4cTNGcw/qPjOGw2wxAQCY3WeblEXjFXcP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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