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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19127a53c4cb323386f3a8bf441406390d99ec8fb6cd95d9aa3537cf6924f025' 
  AND token = 'f4fEGO+FjPf23n9EOqjxMbc7kAS/TqMCl0YrUgAa+sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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