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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '22caa61764e14dc588f89c82aa0cb1523e048841818fda9a10808926ebfe6705' 
  AND token = 'aI9+QBbMXtDcydcdEzRjOXrpEe8APQhcogmZ/q2jcEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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