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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e3194cbaa9237c351bea832a162261e11847e919d99c9183601c84cf2250e95a' 
  AND token = 'QiaancssFDRGfSppnae4xvMXV1ukFr+wPJ4B5p2AoO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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