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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cb8b200a3984efc7ccf9474c87fd3bf90edfeab1e73b221f27c5c66eac3f26d' 
  AND token = 'th9Mb70EcweEPdJBrTYPlgmQetc9IyFXmldN3axefEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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