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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '336d2473d0f307a9a05a7430c72cae95dd7484780ac6c1bf78ec54c443b0afd7' 
  AND token = 'VFzRjTfLcNF+UOCyALb4Ya+3eOiyzaroJcaKqbnPLm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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