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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7c5a4999ec43c3681ba2dd90c3e22629fbe7ab932c3272003164e62dee78044' 
  AND token = '6To5v6zuptyqX3ZeR4fH4YBsiAAn1wryORlgRVimxso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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