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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c04bfd9c2eecc98377c3e36ae60e1586db598e0f4caaa0d33291b7b5c889879c' 
  AND token = '+Yfa0zpZoHCGdJy4AUfVxz7AGq5enxQOEnNl9jF8pNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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