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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '002e2a8613c54f5f52bbc6c6beee5ba18bd18a0caee5f19a4250cb04211b7a98' 
  AND token = '/b3lOGPjZUllzWU9y2MiaihXUq2VdKpcUAJfZNY90mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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