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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5218153eeae9c49a5a199b5f28de3e5c52f4a61c8ead8cbba73b5246b946e69a' 
  AND token = 'RelOmpCmKb7Nf6A1+ASOhoJDWYsbbB8WhUp2UeysfCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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