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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a740ebacc6db9ea869a000717f0c514b9ebdd92dc300288d37b6bee872ea3a28' 
  AND token = 'vWuDG3olQgHIzKb6M+wf2sa3M3m5bi272z/Ujp9pTO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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