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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b951797ae50bd98b4b751e6da0afa39734e7b7c51264e9dd3ac2ca7dfecbeeaf' 
  AND token = 'eQqzp5Yo+GwgewQL+gHjryQsVx10dDiFmIajjBw8pao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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