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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '21a85fb9e74e893a2ce3e1b5de51b05975b37aee041ebcb209f45336530b102a' 
  AND token = 'ZXwkb67i+CK8HtnnEmSY5SHy+DenzDAXqlKiHWPamIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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